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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2005-2011. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_INTERPROCESS_FLAT_MAP_INDEX_HPP
#define BOOST_INTERPROCESS_FLAT_MAP_INDEX_HPP
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <functional>
#include <utility>
#include <boost/interprocess/containers/flat_map.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
//!\file
//!Describes index adaptor of boost::map container, to use it
//!as name/shared memory index
//[flat_map_index
namespace boost { namespace interprocess {
//!Helper class to define typedefs from IndexTraits
template <class MapConfig>
struct flat_map_index_aux
{
typedef typename MapConfig::key_type key_type;
typedef typename MapConfig::mapped_type mapped_type;
typedef typename MapConfig::
segment_manager_base segment_manager_base;
typedef std::less<key_type> key_less;
typedef std::pair<key_type, mapped_type> value_type;
typedef allocator<value_type
,segment_manager_base> allocator_type;
typedef flat_map<key_type, mapped_type,
key_less, allocator_type> index_t;
};
//!Index type based in flat_map. Just derives from flat_map and
//!defines the interface needed by managed memory segments.
template <class MapConfig>
class flat_map_index
//Derive class from flat_map specialization
: public flat_map_index_aux<MapConfig>::index_t
{
/// @cond
typedef flat_map_index_aux<MapConfig> index_aux;
typedef typename index_aux::index_t base_type;
typedef typename index_aux::
segment_manager_base segment_manager_base;
/// @endcond
public:
//!Constructor. Takes a pointer to the segment manager. Can throw
flat_map_index(segment_manager_base *segment_mngr)
: base_type(typename index_aux::key_less(),
typename index_aux::allocator_type(segment_mngr))
{}
//!This reserves memory to optimize the insertion of n elements in the index
void reserve(typename segment_manager_base::size_type n)
{ base_type::reserve(n); }
//!This frees all unnecessary memory
void shrink_to_fit()
{ base_type::shrink_to_fit(); }
};
}} //namespace boost { namespace interprocess
//]
#include <boost/interprocess/detail/config_end.hpp>
#endif //#ifndef BOOST_INTERPROCESS_FLAT_MAP_INDEX_HPP
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